A U-shaped shell and tube type high efficiency fuel and lubricating oil radiator

Abstract

The present invention discloses a U-shaped shell and tube type high-efficiency fuel and lubricating oil radiator, including an inserted head, a tube sheet, a tube bundle and a sheet metal integral spiral baffle. A cross-shaped partition is arranged on one end face of the inserted head, a cross-shaped slot is arranged on one end face of the tube sheet, and the tube sheet is plugged and matched with the cross-shaped partition of the inserted head through the cross-shaped slot and welded to form four partitions, each partition corresponds to a baffle chamber of a tube pass, the tube bundle is a U-shaped tube, and the U-shaped tube has a plum blossom groove pressed inside or a spoiler groove processed on the surface, the two ends of the tube bundle are respectively plugged into the tube sheet, and the two ends of the tube bundle are respectively located in different partitions; the spiral baffle is a sheet metal integrally formed structure and forms a shell pass with the shell assembly, the sheet metal integral spiral baffle has an inclination angle and a turning angle with the tube bundle flow direction, and the tube bundle is plugged with the spiral baffle. The fuel and lubricating oil radiator of the present invention meets the design requirements of light weight, compact structure, not easy to deform under high temperature difference of fuel oil, high heat transfer efficiency and good reliability.

Description

Technical Field

[0001] The invention belongs to the technical field of aviation engine lubrication (lubricating oil) systems, and in particular is a new U-shaped shell-and-tube type high-efficiency fuel and lubricating oil radiator structure with a bypass regulating valve. Background Art

[0002] The fuel and lubricating oil radiator is a key component of the aircraft engine lubrication transmission system. It uses aircraft fuel as a cold source to cool the high-temperature lubricating oil in the engine lubrication transmission system to ensure that the engine lubricating oil is at a good operating temperature. After being heated by the lubricating oil, part of the fuel enters the engine combustion chamber to burn, providing a power source for the engine, and part returns to the aircraft fuel tank.

[0003] Engine fuel oil radiators can be divided into shell and tube type, plate fin type, plate exchange type, etc. according to the heat exchanger structure. Taking the traditional shell and tube fuel oil radiator as an example, it is generally made of aluminum alloy, stainless steel, titanium alloy and other materials, and the main process methods are riveting expansion, vacuum brazing, argon arc and assembly.

[0004] In the design of radiator structure, generally only the fuel safety valve or lubricating oil safety valve is designed in case the radiator core is blocked during use. Filters, filter safety valves, etc. are generally designed and managed as separate accessories.

[0005] Usually, if Figure 2 As shown in the figure, the aviation shell and tube fuel and lubricating oil radiator adopts double-head fixed tube sheet welding, or U-shaped tube double-flow single-head bolt assembly connection. This type of structure is not only complex, but also heavy and has low reliability. Either a pair of tube sheets and heads are connected at both ends of the shell, or the tube sheets, heads and sealing rings are assembled and connected by bolts through flange connection at one end of the shell. The above scheme increases the number of welds and sealing surfaces of the structure, and increases the number and weight of parts, which increases the product failure rate and reduces durability, affecting the reliability of the engine mission.

[0006] According to the functional performance requirements of the aircraft engine lubrication system in different flight conditions, it is hoped that the matching fuel and lubricating oil heat exchanger cooling accessories will not only have the characteristics of light weight, compact structure, high heat transfer efficiency and good reliability, but also require a simple structure, especially to achieve diversified functional performance with high precision requirements under different flight conditions. Summary of the invention

[0007] In order to solve the above problems, the present invention aims to provide a U-shaped shell and tube type high-efficiency fuel and lubricating oil radiator, which is light in weight, compact in structure, not easy to deform under high temperature difference of fuel and lubricating oil, has high heat transfer efficiency and good reliability.

[0008] In order to achieve the above objectives, the present invention adopts the following technical solutions:

[0009] A U-shaped shell and tube type high-efficiency fuel and lubricating oil radiator, the fuel and lubricating oil radiator has four tube passes and multiple shell passes, and includes:

[0010] An insertable end cap, one end face of which is provided with a cross-shaped partition plate, and the insertable end cap is also provided with a fuel inlet and a fuel outlet;

[0011] A tube sheet, wherein a cross-shaped slot is provided on one end surface of the tube sheet, and the tube sheet is plugged and matched with the cross-shaped partition of the insert-type head through the cross-shaped slot and welded to form four partitions, each of which corresponds to a baffle chamber of a tube pass, wherein the fuel inlet and the fuel outlet on the insert-type head correspond to a partition respectively, and a through hole is opened on the cross-shaped partition between the other two partitions;

[0012] The tube bundle is a U-shaped tube, and the U-shaped tube has a plum blossom groove pressed inside or a flow-turbulating groove processed on the surface, and the two ends of the tube bundle are respectively inserted into the tube sheet, and the two ends of the tube bundle are respectively located in different partitions;

[0013] The spiral baffle is a sheet metal integrally formed structure and participates in forming the shell side. The spiral baffle of the sheet metal integrally formed structure has an inclination angle and a rotation angle with the flow direction of the tube bundle, and the tube bundle is plugged with the spiral baffle. It should be noted that the flow direction of the tube bundle here refers to the flow direction of the fluid in the tube bundle or the axial direction of the tube bundle, and the spiral baffle and the shell (shell assembly) form the shell side of the fluid (lubricating oil).

[0014] As a solution, one end of the cross-shaped partition of the inserted head that is plugged into the tube sheet is stepped, and the cross-shaped partition and the cross-shaped slot are assembled with a gap or transition and fixed by welding.

[0015] As a solution, threaded holes are provided at the center of the cross-shaped partition on the inserted head and at the center of the cross-shaped slot on the tube sheet, and the inserted head and the tube sheet are connected by bolts inserted into the threaded holes.

[0016] As a solution, the U-shaped shell and tube type high-efficiency fuel and lubricating oil radiator also includes a shell assembly, which includes a cylinder and a bottom cover that are welded together, or an integrally machined cylinder and a bottom cover, or an integrally cast cylinder and a bottom cover. The cylinder is provided with a lubricating oil inlet and a lubricating oil outlet. The lubricating oil flows into the cylinder from the lubricating oil inlet, completes the shell process along the spiral baffle, and then flows out from the lubricating oil outlet.

[0017] As a solution, the U-shaped shell and tube type high-efficiency fuel and lubricating oil radiator also includes a lubricating oil inlet and outlet assembly and a bypass valve. The lubricating oil inlet and outlet assembly is connected to the lubricating oil inlet and lubricating oil outlet of the shell assembly, and a bypass valve is provided in the lubricating oil inlet and outlet assembly.

[0018] As a solution, the bypass valve detects the temperature difference or pressure difference between the lubricating oil inlet and the lubricating oil outlet, and drives the bypass valve to adjust the lubricating oil flow according to the temperature difference or pressure difference.

[0019] As a solution, the U-shaped tube shell type high-efficiency fuel and lubricating oil radiator also includes a mounting support, which is arranged on the cylinder body and has a three-point mounting structure.

[0020] As a solution, the U-shaped shell and tube type high-efficiency fuel and lubricating oil radiator also includes a fuel inlet and outlet joints, which include an inlet joint and an outlet joint, which are respectively connected to the fuel inlet and fuel outlet on the inserted head, and the fuel inlet and outlet joints adopt eccentric ball joints.

[0021] As a solution, the tube sheet, tube bundle and spiral baffle are integrally assembled by vacuum brazing or riveting to form a heat exchange core, and the heat exchange core is connected to the insert head by vacuum electron beam welding or argon arc welding to form a rigid core structure.

[0022] As a solution,

[0023] The tube bundle is a pure titanium tube, an aluminum alloy tube, a stainless steel tube, a nickel alloy tube or a high-temperature alloy tube, and is formed into a heat exchange tube by pressing a plum blossom groove inside or machining a spoiler groove on the surface and then bending the sheet metal;

[0024] The spiral baffle is integrally formed by drawing a sheet metal or integrally machined and then the baffle tube holes are formed by laser drilling.

[0025] Compared with the prior art, the present invention is based on the strict weight reduction requirements of aircraft engines for accessories. On the premise of meeting the heat exchange performance, structural strength and fatigue strength, the overall material of the fuel and lubricating oil radiator can be selected from aluminum alloy and titanium alloy materials. Stainless steel materials can also be used if the weight margin is sufficient.

[0026] The new U-shaped shell-and-tube high-efficiency fuel and lubricating oil radiator for aircraft engines of the present invention is based on the structure of the traditional shell-and-tube heat exchanger. The head and the tube sheet are designed to be assembled in an inserted manner and then packaged by electron beam welding or argon arc welding to form a tube channel. The heat exchange tube is a U-shaped tube, which reduces the number of heads and tube sheets, and achieves the purpose of weight reduction in structure. At the same time, the inserted head and the outer edge of the U-shaped tube bundle heat exchange core are connected to form a rigid core structure by vacuum electron beam welding or argon arc welding, replacing the flange assembly bolts between the tube sheet, and further reducing the weight. The traditional assembly sealing surface is eliminated, the strength and rigidity of the product are improved, the quality failure rate is reduced, and the reliability of the engine operation is guaranteed.

[0027] The novel U-shaped shell-and-tube type high-efficiency fuel and lubricating oil radiator for aircraft engines of the present invention improves heat exchange performance in the following aspects:

[0028] (1) The "cross" shaped partition structure on the plug-in head is connected to the "cross" shaped slot on the tube sheet by gap or transition fit to form four partitions, each of which is a four-pass tube bundle with one tube pass (fuel oil) baffle chamber;

[0029] (2) The heat exchange tubes of the U-shaped tube bundle are pressed with plum blossom grooves inside or turbulent pits on the surface to form turbulent flow of the cold and hot fluids flowing through the tube wall, thereby improving the heat exchange efficiency;

[0030] (3) The integral spiral baffles in the shell side (integrally formed by sheet metal or integrally formed by machining) form a certain inclination angle and turning angle with the flow direction of the tube bundle, thereby increasing the turbulent effect of the flow in the shell side.

[0031] By adopting the U-shaped shell and tube type high-efficiency fuel and lubricating oil radiator structure of the present invention, when the temperature difference between the cold and hot fluids is large and thus the temperature difference between the shell wall and the tube wall is greater than 50°C, the heat exchange structure maintains good rigidity and has good resistance to thermal deformation, and there is no need to consider thermal compensation and thermal expansion issues. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 It is a schematic diagram of the product structure of the present invention;

[0033] Figure 2 This is a schematic diagram of the structure of a traditional flanged head U-tube bundle shell and tube fuel and lubricating oil radiator;

[0034] Figure 3 and Figure 4 Schematic diagram of the U-tube bundle heat exchange core structure at two different angles;

[0035] Figure 5 It is a schematic diagram of the structure of a U-shaped heat exchange tube with an internal hexalobular groove or a spoiler groove on the surface;

[0036] Figure 6 , Figure 7 and Figure 8 It is a schematic diagram of the inserted head structure with a "cross" shaped partition;

[0037] Fig. 9 , Fig.10 and Fig.11 The schematic diagram of the tube sheet structure with a "cross" groove;

[0038] Fig.12 It is a schematic diagram of the structure of the shell assembly;

[0039] Fig.13 and Fig.14 Schematic diagram of bypass valve structure;

[0040] Fig.15 Schematic diagram of the eccentric ball joint structure;

[0041] Fig.16 and Fig.17 The schematic diagram of the support structure is shown in FIG.

[0042] Fig.18 It is a schematic diagram of the structure of the spiral baffle formed integrally by sheet metal;

[0043] In the figure: 1-fuel inlet and outlet joints, 2-inserted head, 3-tube sheet, 4-tube bundle, 5-shell assembly, 6-mounting support, 7-lubricating oil inlet and outlet assembly, 8-bypass valve, 9-spiral baffle. DETAILED DESCRIPTION

[0044] The present invention is further described below in conjunction with the accompanying drawings and specific embodiments, but it should not be understood that the scope of the subject matter described in the present invention is limited to the following embodiments. Without departing from the above-mentioned technical ideas of the present invention, various modifications, substitutions and changes made according to the common technical knowledge and customary means in the field are included in the scope of the present invention.

[0045] like Figure 2 The figure shows the traditional flanged head U-tube bundle shell and tube fuel oil radiator structure. Figure 2 compared to, Figure 1 The features of the present invention are demonstrated as a whole. The U-shaped shell and tube type high-efficiency fuel oil radiator of the present invention adopts a "cross" partition structure on the inserted head 2 and a "cross" slot on the tube plate 3 for insert assembly connection through gaps or transition fits, forming four partitions, each partition being a four-flow tube bundle of a tube side (fuel) baffle chamber, thereby increasing the heat exchange capacity; the U-shaped tube bundle 4 is made of corresponding materials and is bent and formed into a heat dissipation tube component, and the stamped spoiler pits on the heat dissipation tube make the cold and hot fluids flowing through the tube wall form turbulence, thereby improving the heat exchange performance; the integrated spiral baffle 9 in the shell side forms a certain inclination angle and turning angle with the tube bundle flow direction (the flow direction of the fluid in the tube bundle 4 or the axial direction of the tube bundle 4), thereby increasing the turbulent effect of the flow in the shell side and improving the heat exchange performance.

[0046] In the fuel and lubricating oil radiator of the present invention, the heat exchange tube bundle 4 adopts a U-shaped tube, and forms a U-shaped tube bundle heat exchange core with the tube sheet 3 through a brazing process or an expansion process. The tube bundle 4, the tube sheet 3 and the inner cavity of the inserted head 2 adopt a clearance fit to form a baffle chamber of the four-flow tube pass. The outer edge is connected into a rigid body by argon arc welding or vacuum electron beam welding, and finally packaged with the shell component 5 to form a heat exchanger assembly. The overall structure is compact and the processability is excellent, which reduces the complexity of the product structure, thereby reducing the product failure rate, improving the product durability and reliability, and achieving the weight reduction effect.

[0047] like Figure 1As shown, a compact and lightweight new U-shaped shell and tube type high-efficiency fuel and lubricating oil radiator structure for aircraft engine fuel and lubricating oil system includes a fuel inlet and outlet joint 1, an inserted head 2, a tube sheet 3, a tube bundle 4, a lubricating oil shell assembly 5, a mounting support 6, a lubricating oil inlet and outlet assembly 7, a bypass valve 8 and a spiral baffle 9. The tube sheet 3, the tube bundle 4 and the spiral baffle 9 are assembled into a heat exchange core by integral vacuum brazing or riveting. The inserted head 2 and the outer edge of the heat exchange core are connected to form a rigid core structure by vacuum electron beam welding or argon arc welding. The fuel inlet and outlet joint 1, the rigid core structure and the lubricating oil inlet and outlet assembly 7 are connected to form a rigid structure by argon arc welding, and then assembled and connected with the bypass valve 8 to form a cooler assembly.

[0048] like Figure 3 and Figure 4 As shown, the heat exchange core (tube sheet 3, tube bundle 4, spiral baffle 9 welded or riveted) is the key functional part of the fuel and lubricating oil radiator. It is a U-shaped tube bundle structure with compact structure and high heat transfer efficiency. The tube sheet 3 and the heat exchange tube bundle 4 are assembled by integral vacuum brazing or riveting. The remaining parts include an integrated spiral baffle 9, a positioning rod, etc. to form a shell-side flow channel, so that the fluid crosses the tube bundle 4, that is, the fluid flow direction is perpendicular to the axial flow of the tube bundle 4.

[0049] like Figure 5 As shown, the U-shaped heat exchange tube bundle 4 is made of pure titanium tubes, aluminum alloy tubes, stainless steel tubes, nickel alloy tubes or high-temperature alloy tubes with light weight, high heat transfer efficiency, good welding processability and high strength, and is made into heat exchange tubes with plum blossom grooves inside or spoiler grooves on the surface through sheet metal bending technology and pitting technology.

[0050] like Figure 6 , Figure 7 and Figure 8 As shown, the plug-in head 2 is an plug-in head with a "cross" shaped partition. The end of the partition on the plug-in head 2 is designed in a step form. There are control requirements for the shape and position tolerances such as the matching tolerance and symmetry at the assembly position to ensure the assembly accuracy of the partition of the plug-in head 2 and the slot of the tube sheet 3. Figure 6 As shown, one of the "cross"-shaped partitions has a through hole connected to two baffle chambers, and no fuel inlet or fuel outlet is provided on the two baffle chambers.

[0051] like Fig. 9 , Fig.10 and Fig.11As shown, the tube sheet 3 adopts a tube sheet structure with a "cross"-shaped slot, and has control requirements on the slot matching tolerance, symmetry and other form and position tolerances to ensure the assembly accuracy of the partition of the inserted head 2 and the slot of the tube sheet 3. At the same time, when the tube pressure is large, threaded holes can be designed in the center of the tube sheet 3 and the inserted head 2, and the inserted head 2 and the tube sheet 3 can be reinforced with bolts to ensure the structural strength. The tube sheet 3 adopts 1, 2, 3, 4 four-quadrant symmetrical partitioning to symmetrically and evenly divide the U-shaped tube bundle 4 into 4 tube passes.

[0052] like Fig.13 and Fig.14 As shown, the bypass valve 8 is installed at the shell outlet or inlet, and accurately adjusts the flow on the shell side by intelligent automatic control through sensing the fluid temperature difference or the pressure difference at both ends, so as to achieve the precise heat exchange performance requirements of the engine lubrication system under different flight conditions. At the same time, when the pressure difference of the product is too large, it starts to relieve pressure to ensure system safety.

[0053] like Fig.18 As shown, the integral spiral baffle 9 is formed by sheet metal drawing or integral machining, and then the baffle tube holes are formed by laser drilling. The integral spiral baffle 9 forms a certain inclination angle and turning angle with the flow direction of the tube bundle 4, which increases the turbulence effect of the flow in the shell side and improves the heat exchange performance.

[0054] The main improvements of the present invention include the following aspects:

[0055] 1) Shell and tube heat exchanger consisting of an inserted head 2 and a U-shaped tube bundle 4: Figure 6 , Figure 7 and Figure 8 In the heat exchanger, the insert-type head structure 2 is designed with a "cross"-shaped partition plate on the end face, forming a symmetrical partition of four quadrants. The insert-type head 2 is made of aluminum alloy, titanium alloy or stainless steel, nickel alloy, and high-temperature alloy, which is machined as a whole, improving the compactness of the product structure. The insert-type head 2 and the tube sheet 3 are assembled with an insert gap and then welded to form four tube-pass baffle chambers. The insert-type packaging reduces the number of welds and eliminates the need for welding. Figure 2 The traditional flange packaging structure makes the heat exchanger more compact and lighter.

[0056] 2) U-shaped tube bundle heat exchange core composed of tube sheet 3, tube bundle 4 and spiral baffle 9: The heat exchange core is designed as a U-shaped tube bundle structure. Only one tube sheet 3 is used to form the tube side channel. The inlet and outlet on the tube side are arranged on the same side, and the space is reasonably utilized to improve the heat exchange performance of the radiator. The shell side adopts a seven-pass structure, and the tube side adopts a four-pass reverse cross flow structure, which improves the heat exchange performance of the radiator. A tube sheet 3 with a "cross" slot is used on the tube side of the heat exchange core to reduce the number of welds packaged between the inserted head 2, cancel the traditional flange connection structure, simplify the packaging form, and improve the compactness of the product.

[0057] 3) Shell assembly 5: Fig.12 As shown, the shell assembly 5 is welded by the cylinder and the bottom cover. When the shell wall thickness is large, it can also be machined as a whole by casting or bar material, and finally packaged together with the heat exchange core by welding to form the heat exchanger shell, making the product structure more compact. The mounting bracket on the shell assembly 5 adopts a three-point mounting support 6, which has a simple structure and reliable installation.

[0058] 4) U-shaped heat exchange tube: such as Figure 5 As shown, the U-shaped tube bundle 4 is made of aluminum alloy tubes, titanium alloy tubes, nickel alloys, and high-temperature alloys that are easy to bend and form, and is connected to the tube sheet through vacuum brazing or riveting to form a heat exchange core. The U-shaped tube bundle 4 can have a plum blossom groove pressed inside or a flow-disturbing groove punched on the surface to disrupt the laminar flow through the tube wall, form turbulence to achieve a flow-disturbing effect, and improve heat exchange efficiency.

[0059] 5) Spiral baffles 9 integrally formed by sheet metal or machined: Figure 3 and Fig.18 As shown, the spiral baffles 9 in the shell side form a certain inclination angle and turning angle with the flow direction of the tube bundle, thereby increasing the turbulence effect of the flow in the shell side and improving the heat exchange performance.

[0060] 6) Bypass valve 8: Fig.13 and Fig.14 As shown, the bypass valve 8 is assembled in the lubricating oil inlet and outlet assembly 7 and corresponds to the shell outlet or inlet. It can sense the fluid temperature difference or the pressure difference at both ends to intelligently and automatically control and accurately adjust the flow on the shell side, so as to achieve the precise heat exchange performance requirements of the engine lubrication system under different flight conditions and multiple working conditions. At the same time, when the pressure difference of the product is too large, it starts to relieve pressure to ensure system safety.

[0061] 7) Fuel inlet and outlet connector 1: Fig.15 As shown, the fuel inlet and outlet joints 1 of the pipe are arranged on the same side, which makes reasonable use of the space. The fuel inlet and outlet joints 1 adopt an eccentric ball joint form, which can effectively compensate for the assembly gap caused by the poor assembly of the engine fuel and lubricating oil system pipe joints when the heat exchanger is assembled on the engine, thereby ensuring the assembly sealing of the fuel inlet and outlet joints 1.

[0062] The above embodiments are not intended to limit the protection scope of the present invention. Any deformation, modification or equivalent substitution made on the basis of the technical solution of the present invention shall fall within the protection scope of the present invention.

Claims

1. A U-shaped shell and tube type high efficiency fuel and lubricating oil radiator, characterized in that: The lubricating oil radiator has four tube passes and multiple shell passes, and includes: An insertable end cap (2), wherein a cross-shaped partition is arranged on one end surface of the insertable end cap (2), and a fuel inlet and a fuel outlet are also provided on the insertable end cap (2); A tube sheet (3), wherein a cross-shaped slot is provided on one end surface of the tube sheet (3), and the tube sheet (3) is plugged and matched with the cross-shaped partition of the insert-type end cap (2) through the cross-shaped slot and welded to form four partitions, each of which corresponds to a baffle chamber of a tube pass, wherein the fuel inlet and the fuel outlet on the insert-type end cap (2) correspond to a partition respectively, and a through hole is provided on the cross-shaped partition between the other two partitions; A tube bundle (4), wherein the tube bundle (4) is a U-shaped tube, and a plum blossom groove is pressed inside the U-shaped tube or a flow-turbulating groove is processed on the surface, and both ends of the tube bundle (4) are respectively inserted into the tube sheet (3), and the two ends of the tube bundle (4) are respectively located in different partitions; A spiral baffle (9), wherein the spiral baffle (9) is a sheet metal integrally formed structure and participates in forming the shell side, the spiral baffle (9) of the sheet metal integrally formed structure has an inclination angle and a rotation angle with the flow direction of the tube bundle, and the tube bundle (4) is plugged into the spiral baffle (9); The tube sheet (3), tube bundle (4) and spiral baffle (9) are integrally assembled by vacuum brazing or riveting to form a heat exchange core, and the heat exchange core is connected to the insert-type head (2) by vacuum electron beam welding or argon arc welding to form a rigid core structure.

2. The U-shaped tube shell type high efficiency fuel and lubricating oil radiator according to claim 1 is characterized in that: One end of the cross-shaped partition of the inserted head (2) that is plugged into the tube sheet (3) is in a step shape, and the cross-shaped partition and the cross-shaped slot are assembled with a gap or transition and fixed by welding.

3. The U-shaped tube shell type high efficiency fuel and lubricating oil radiator according to claim 1 is characterized in that: A threaded hole is provided at the center of the cross-shaped partition on the insertable head (2) and at the center of the cross-shaped slot on the tube sheet (3), and the insertable head (2) and the tube sheet (3) are connected by bolts inserted into the threaded holes.

4. The U-shaped tube shell type high efficiency fuel and lubricating oil radiator according to claim 1 is characterized in that: It also includes a shell assembly (5), which includes a cylinder and a bottom cover that are welded together, or an integrally machined cylinder and a bottom cover, or an integrally cast cylinder and a bottom cover. The cylinder is provided with a lubricating oil inlet and a lubricating oil outlet. The lubricating oil flows into the cylinder from the lubricating oil inlet, completes the shell process along the spiral baffle (9), and then flows out from the lubricating oil outlet.

5. The U-shaped tube shell type high efficiency fuel and lubricating oil radiator according to claim 4 is characterized in that: It also includes a lubricating oil inlet and outlet assembly (7) and a bypass valve (8), wherein the lubricating oil inlet and outlet assembly (7) is connected to the lubricating oil inlet and lubricating oil outlet of the casing assembly (5), and the bypass valve (8) is arranged in the lubricating oil inlet and outlet assembly (7).

6. The U-shaped tube shell type high efficiency fuel and lubricating oil radiator according to claim 5 is characterized in that: The bypass valve (8) detects the temperature difference or pressure difference between the lubricating oil inlet and the lubricating oil outlet, and drives the bypass valve (8) to adjust the lubricating oil flow according to the temperature difference or pressure difference.

7. The U-shaped tube shell type high efficiency fuel and lubricating oil radiator according to claim 4 is characterized in that: It also comprises a mounting support (6), wherein the mounting support (6) is arranged on the cylinder body, and the mounting support (6) is a three-point mounting structure.

8. The U-shaped tube shell type high efficiency fuel and lubricating oil radiator according to claim 1 is characterized in that: It also comprises a fuel inlet and outlet joint (1), the fuel inlet and outlet joint (1) comprising an inlet joint and an outlet joint, the inlet joint and the outlet joint are respectively connected to the fuel inlet and the fuel outlet on the inserted head (2), and the fuel inlet and outlet joint (1) adopts an eccentric ball joint.

9. The U-shaped tube shell type high efficiency fuel and lubricating oil radiator according to claim 1 is characterized in that: The tube bundle (4) is a pure titanium tube, an aluminum alloy tube, a stainless steel tube, a nickel alloy tube or a high-temperature alloy tube, and is formed into a heat exchange tube by pressing a plum blossom groove inside or machining a spoiler groove on the surface and then bending the sheet metal; The spiral baffle (9) is integrally formed by drawing a sheet metal and then the baffle tube holes are formed by laser drilling.

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